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D( P )
P = 0
P = 0
P = 0
P in (-oo:0) U (0:+oo)
3/P-(5/P)+1 = 0
3/P-5*P^-1+1 = 0
-2*P^-1 = -1 // : -2
P^-1 = 1/2
-1 < 0
1/(P^1) = 1/2 // * P^1
1 = 1/2*P^1 // : 1/2
2 = P^1
P = 2
P = 2
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